Android Retrofit2 Post请求添加Json类型参数笔记

Posted 2022-07-31 却把清梅嗅

Android Retrofit2 Post请求添加Json类型参数笔记

一.添加Header

1.添加单独Header

对于某个API所需要添加Header时，可以直接在Service接口上添加@Headers注解：

@Headers(
            "Content-Type: application/json;charset=UTF-8",
            "User-Agent: Retrofit-your-App")
@GET(ConstantsApi.douban_in_theaters)
Observable<MovieTheatersModel> requestTheatersMovies(@Query("city")String city,
                                                         @Query("count")Integer count,
                                                         @Query("start")Integer start);

2.添加共同Header

如上，我们可以发现，大部分API「”Content-Type: application/json;charset=UTF-8”」都是Header中必须的，那么我们可以直接添加在拦截器中：

new Retrofit.Builder()
           .addConverterFactory(GsonConverterFactory.create())

           .client(new OkHttpClient.Builder()
                   .addInterceptor(new Interceptor() 
                       @Override
                       public Response intercept(Chain chain) throws IOException 
                           Request request = chain.request()
                                   .newBuilder()
                                   .addHeader("Content-Type", "application/json;charset=UTF-8")
                                   .addHeader("header2", "123456")
                                   .addHeader("header3", "123456")
                                   .addHeader("header4", "123456")
                                   .build();
                           return chain.proceed(request);
                       
                   ).build();

然后你说直接这样每次都add一个匿名的intercept,令人头大的缩进，也太不软件工程了，那就直接封装一个：

public class MyInterceptor implements Interceptor 

    @Override
    public Response intercept(Chain chain) throws IOException 
        Request request = chain.request()
                .newBuilder()
                .addHeader("Content-Type", "application/json;charset=UTF-8")
                .addHeader("header2", "123456")
                .addHeader("header3", "123456")
                .addHeader("header4", "123456")
                .build();
        return chain.proceed(request);
    

每次请求需要这些header的时候只需要：

HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
MyInterceptor myInterceptor = new MyInterceptor();

OkHttpClient client = new OkHttpClient()
        .newBuilder()
        .addInterceptor(httpLoggingInterceptor)
        .addInterceptor(myInterceptor)
        .build();//添加自定义Interceptor
movieService = new Retrofit.Builder()   //配合Retrofit
          .baseUrl(ConstantsApi.BASE_DOUBAN)
          .addConverterFactory(GsonConverterFactory.create())
          .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
          .client(client)
          .build()
          .create(DoubanMovieService.class);

二.添加Json类型Body

假定需求Json格式如下：

    "param1": "111",
    "param2": "222",
    "data": 
        "param3": "string",
        "param4": "string2"
    

1.创建JsonObject对象

 JSONObject root = new JSONObject();
 JSONObject requestData = new JSONObject();
 try 
     requestData.put("param3", "string");
     requestData.put("param4", "string2");
     root.put("param1", "111");
     root.put("param2", "222");
     root.put("data", requestData);
  catch (JSONException e) 
     e.printStackTrace();
 

2.API 接口设置

@POST("api/data?")
Observable<PromotionModel> getResult(@Body RequestBody requestBody);

3.联网请求（包含上述1中代码）

JSONObject root = new JSONObject();
JSONObject requestData = new JSONObject();
try 
    requestData.put("param3", "string");
    requestData.put("param4", "string2");
    root.put("param1", "111");
    root.put("param2", "222");
    root.put("data", requestData);
 catch (JSONException e) 
    e.printStackTrace();


RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"),root.toString());

OkHttpClient client = new OkHttpClient.Builder()
        .addInterceptor(new Interceptor())
        .addInterceptor(logging)
        .build();
service = new Retrofit.Builder()
        .client(client)
        .baseUrl(Constants.BASE_URL)
        .addConverterFactory(GsonConverterFactory.create())
        .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
        .build()
        .create(Service.class);
return service.getResult(requestBody);